Luthier CS50 HT Guitar Strings with Super Carbon 101 trebles, Full Set

Not able to restring yet, as need new machine heads for my M. 1973 Kohno Model #8. Does anyone know how / where one can obtain these? The rollers are 1.5 inches on center

I purchased 6 sets of carbon strings to try. Unfortunately, I only have one guitar and I am waiting till the current strings wear out before I try the others. I can say that the service I receive from Strings by Mail, I could not be happier with.